Comtech EF Data’s Advanced VSAT Series products offer industry-leading solutions for cellular backhaul, Universal Service Obligation (USO) networks, corporate networks, Internet Service Providers and other applications requiring high-performance IP transport in a hub-spoke network environment. Incorporating advanced technologies developed by Comtech EF Data, Comtech AHA and Memotec, these products are specifically designed to provide unmatched performance at an attractive price for a wide range of applications in a hub-spoke environment.

The Advanced VSAT Series includes the CDM-800 Gateway Router, the CDM-840 Remote Router, the ODM-840 Remote Router (outdoor version of CDM-840), the CDD-880 Multi-Receiver Router and the CXU- 810 RAN Optimizer. The products incorporate industry-leading WAN bandwidth optimization to provide the most efficient:

Physical layer transport without compromising latency

Link layer transport

Higher layer transport

Radio Access Network (RAN) backhaul

Designed for use at the hub site, the CDD-880 can receive transmissions from up to 12 CDM-840 Remote Routers. It combines a number of advanced technologies in a 1RU platform enabling the most efficient return channel for hub-spoke networks:

VersaFEC® low-latency LDPC

Ultra low overhead Streamline Encapsulation (SLE)

Lossless Payload decompression

Header decompression

Typical Users

Mobile Operators

Telecom Operators

Offshore & Maritime

Enterprise

Internet Service Providers (ISPs)

Common Applications

Mobile Backhaul with RAN Optimization

Universal Service Obligation (USO) networks

Corporate networks

Internet access (ISP)

Maritime & offshore communications

Integrated Router

For efficient IP networking and transport over satellite, the CDD-880 features integrated routing capability with very low overhead encapsulation, header decompression, and payload decompression. It ensures the highest quality of service with minimal jitter and latency for real-time traffic, priority treatment of mission critical applications and maximum bandwidth efficiency.

The CDD-880 supports header decompression for IP traffic that is compatible with CDM-840’s (and CDM-625’s) industry-leading header compression. Header compression can reduce the 40 byte IP/UDP/RTP header to as little as 1 byte. For TCP/IP, the 40 byte header is reduced to as little as 3 bytes. For applications such as VoIP, header compression can provide bandwidth savings exceeding 60%. E.g. 8 kbps G.729 voice codec requires 24 kbps of IP bandwidth once encapsulated into an IP/UDP/RTP datagram. With header compression, the same voice call needs about 8.5 kbps – a saving of almost 65%. Bandwidth requirements for typical Web/HTTP traffic can also be reduced by 10% or more with TCP/IP header compression.

Lossless Payload Decompression

The CDD-880 supports industry-leading 2nd generation lossless payload decompression for IP traffic that is compatible with CDM-840’s (and CDM-625’s) industry-leading payload compression. Implemented in the hardware for maximum throughput and efficiency, payload compression can reduce the required satellite bandwidth by as much as 40-60%.

Advanced Quality of Service (QoS)

The CDD-880 transparently passes the QoS prioritization established at the transmit end by CDM-840 (or CDM-625).

Advanced FEC

CDD-880 supports VersaFEC Low-latency LDPC. VersaFEC is a patented (Covered by U.S. patents 7,353,444 and 7,415,659. Other patents pending) system of high performance short-block low-latency LDPC codes designed to support latency-sensitive applications, such as cellular backhaul over satellite. VersaFEC provides excellent coding gain with lowest possible latency. VersaFEC’s coding performance is similar to that of DVB-S2 (short block) or LDPC (16k block) with up to 95% lower latency.

Adaptive Coding and Modulation (ACM) Capable

Satellite users have traditionally relied on worst case link margin to overcome rain fade and other impairments which leads to significant inefficiencies. ACM converts the available link margin into increased throughput – gain of 100% or more is possible. ACM maximizes throughput under all conditions – rain fade, inclined orbit satellite operation, antenna mispointing, noise, interference and other impairments.